Development of Ultra-high Density Three-dimensional Optical Data storage System

超高密度三维光学数据存储系统的研制

• 批准号: 09355008
• 负责人: MISAWA Hiroaki
• 金额: $ 18.11万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09355008/
• 关键词: three-dimensional optical data storage; three-dimensional optical memory; silica glass; femtosecond pulse; change in refractive index; anneal; multiphoton process; luminescence; 欠陥; 三次元メモリ; PMMA

Optical data storage systems, such as CD and DVD, are now widely used. However, capacity of such currently available storage systems are not enough for recording movies in a high-quality even the storage densities are almost reaching to the theoretical limit. Accordingly a new data storage system is required. We have developed three-dimensional (3D) optical data storage system using silica as recording material, and clarified the following points :1. By irradiation of picosecond or femtosecond single pulse, a change in reflactive index is induced in a small domain (reffered as "bit") through a multiphoton process. Using such an effect, a three-dimensional data storage system can be constructed.2. The time-period to generate a bit was about 400 ps.3. A small hollow was generated at the center of the bit.4. The bits are thermally stable extremely ; by annealing at 1150 degree no change was induced in optical microscope image.5. The bits showed a specific luminescence spectra. The luminescence intensity was reduced by thermal annealing ; by annealing at 500 degree the luminescent property was almost lost.6. For multi-layer recorded samples, each layer was independently read by both transmission and luminescence images.7. In the other materials such as PMMA, the same effect was found.

诸如CD和DVD的光学数据存储系统现在被广泛使用。然而，这种当前可用的存储系统的容量不足以以高质量记录电影，即使存储密度几乎达到理论极限。因此，需要新的数据存储系统。我们研制了以二氧化硅为记录材料的三维光数据存储系统，并阐明了以下几点：1。利用皮秒或飞秒单脉冲辐照，通过多光子过程在一个小区域（称为“比特”）内引起折射率的变化。利用这种效应，可以构建三维数据存储系统.产生比特的时间周期约为400 ps。3.在钻头中心产生一个小的凹陷。该钻头具有极高的热稳定性，在1150 ℃退火后，光学显微镜图像无变化.这些碎片显示出特定的发光光谱。热退火降低了发光强度，500 ℃退火后发光性能几乎丧失.对于多层记录的样品，通过透射和发光图像两者独立地读取每一层。在其他材料如PMMA中，发现了相同的效果。

项目成果

S.Juodkazis: "Photoelectrochemical Submicrometer Patterningof Titanium Dioxide by Platinum" Journal of Electroanalytical Chemistry. (in press). (1999)

S.Juodkazis：“铂二氧化钛的光电化学亚微米图案化”电分析化学杂志。

H.-B. Sun et al.: "Microfabrication and Characteristics of Two-Dimensional Photonic Crystal Structures in Vitreous Silica"Opt. Rev.. 6. 396-398 (1999)

H.-B。

H.-B.Sun: "Photonic Lattices Achieved with High Power Femtosecod Laser Microcexplosion in Transparent Solid Materials"Proc.of SPIE. 3888. 131-142 (2000)

H.-B.Sun：“利用高功率飞秒激光微爆炸在透明固体材料中实现的光子晶格”Proc.of SPIE。

H.-B.Sun: "Generation and Recombination of Defects Induced by Femtosecond IR Laser Irradiation in Vitreous Silica"J.Phys.Chem.B. (in press). (2000)

H.-B.Sun：“飞秒红外激光照射在玻璃状二氧化硅中诱导的缺陷的产生和重组”J.Phys.Chem.B。

H.-B. Sun et al.: "Photonic Lattices Achieved with High Power Femtosecond laser Microexplosion in Transparent Solid Materials"Proc. of SPIE. 3888. 131-142 (2000)

H.-B。